BEETLE GENUS ONTHOPHAGUS— HOWDEN, CARTWRIGHT 39 



anterior angles, along anterior margins, and with scattered fine punc- 

 tures near posterior edge, the punctures anteriorly finely tuherculate 

 at front margins and usually bearing long reddish setae. In 

 polyphemi, the pmictures are more numerous anteriorly, with con- 

 spicuous tubercles. Posterior half of pronotal midline shallowly but 

 distinctly impressed, Elytral striae shallow, faintly punctate; 

 intervals impunctate or nearly so except marginally, second and third 

 intervals impunctate on discal portion or having no more than five 

 small punctures which are slightly tuherculate anteriorly; other 

 intervals punctate, but with tubercles and setae much less conspicuous 

 than is typical for polyphemi. Pygidium with scattered coarse seti- 

 gerous punctures, punctures nearly obsolete medially. Ventral 

 surfaces very similar to typical polyphemi, but with punctures slightly 

 reduced in number and size. Punctures of legs reduced but similar 

 otherwise. 



Male minor (paratype).^ — Length 4.5 mm., width 2.7 mm. 

 Except for differences in punctures, tubercles, and setae, the morpho- 

 logical modifications of the male minor are the same as described for 

 typical polyphemi. Head in the male minor with setae of clypeus 

 and frons more obvious. Pronotum with punctures and setae more 

 pronounced and slightly more numerous; pronotal disc with many 

 minute punctures scattered over surface, all lacking setae. Second 

 and third elytral intervals nearly impunctate, with even fewer punc- 

 tures than in holotype. Pygidium with smaller punctures and sur- 

 face less alutaceous than in male major. Ventral surfaces not notice- 

 ably differing from male major. 



Allotype. — Female, length 5.7 mm., width 3.3 mm. Differing 

 from male major in the same ways as described for typical polyphemi. 

 Disc of clypeus with 16 or fewer setigerous punctures, tubercles at 

 anterior edge of punctures small, smooth surface between finely 

 alutaceous; frons with 12 setigerous punctures; genae largely impunc- 

 tate. Pronotum sparsely setigerously punctate anteriorly and 

 laterally, impunctate medially except for a few very fine nonsetigerous 

 punctures. In typical polyphemi females, the lateral punctures are 

 larger and cover a more extended area, and the secondary punctures 

 are pronounced on fresh specimens. Pronotum with posterior half 

 of midline shallowly impressed. Second interval of the elytra lack- 

 ing tubercles, the thu'd with only one or two tuherculate punctures, 

 none of the intervals with the fairly regular one or two rows of seti- 

 gerous punctures noted in polyphemi. Ventral surfaces of the two 

 subspecies similar, with sparsisetosus having the number and size of 

 the setae and punctures somewhat reduced. 



Variation. — ^In the paratypic series, length ranges from 4.5 mm. 

 to G.9 and width from 2.7 to 3.9 mm. There is some variation 



